1. (a)Calculate the number of different ways of arranging 10 solute molecules. 　 Each solute molecule occupies one lattice position. (b)Calculate the number of different ways of arranging an oligomer 　 consisting of 10 repeating units in a lattice of 100 positions. (c)What are the main differences in terms of thermodynamic state functions between binary mixtures based on low molecular weight species and the low and high molecular weight species.Please be quantitative. 2. Natural rubber with density p=0.90gm/cc , Mn(bar)=75000 amd Mc=6000 is to be stretched from 10 cm to 15 cm. What is the force per unit area required? If a single chain of this rubber is subject to a tensile force of 10^-5 dyne in the z-direction, what will be the average end-to-end distance in the x,y,and z directions? 3. Consider the consequences of heating a stressed versus an unstressed elastomer. 实在是都找不到资料，想找书看也都被借光了， 希望板上有大大好心可以指点一下，小妹会赠送P币2000以上，谢谢<(_ _)> -- 当悲伤到达饱合，连泪水都乾枯的时刻， 我在兀自发亮的厨房舖上垫被， 然後像莱纳斯一样紧紧裹着毛毯睡去。 我知道我可以在那里安度长夜，迎接黎明 只想在星空下入睡。在曙色中醒来。此外一切都无所谓。吉本ばなな-厨房 --

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